[wildekek]

What does this implement/fix?

AGENTS.md (which CLAUDE.md links to) only described the TUI and the daemon. So the aiosendspin 10 bump in #305 was tested without sendspin serve, and Sendspin Party broke until #307 fixed it.

This adds serve mode to the guide:

• Overview: the CLI has three modes, and serve mode runs on aiosendspin's server side, so it needs its own testing.
• Architecture: a diagram of the serve/ package, from decoding and workers to SendspinPlayerServer and the sendspin-js web player.
• File responsibilities: each file in sendspin/serve/, including PartyPairingStore, and the rule that the sendspin-js version pinned in web/app.js must speak the same protocol version as aiosendspin.
• Key dependencies: sendspin-js and PyAV, and aiosendspin as both client and server.
• Common tasks: sendspin serve --demo, plus a "Bumping aiosendspin" checklist covering the TUI, the daemon (including two servers), serve mode in a browser, and a grep of all of sendspin/ for changed APIs.

Documentation only; no code changes.

Related issue (if applicable):

• Follows Bump aiosendspin to 10.2.1 (Sendspin 1.0) #305 and Fix Sendspin Party with aiosendspin 10.2 #307

Types of changes

• Bugfix (non-breaking change which fixes an issue): bugfix
• New feature (non-breaking change which adds functionality): new-feature
• Enhancement to an existing feature: enhancement
• Breaking change (changes CLI options, settings, hooks or the protocol in a way that is not backwards compatible): breaking-change
• Refactor (no behavior change): refactor
• Documentation only: documentation
• Maintenance / chore: maintenance
• CI / workflow change: ci
• Dependencies bump: dependencies

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